var a=function(a){return"string"==typeof a?a.length>0:"number"==typeof a},t=function(a,t,o){return void 0===t&&(t=0),void 0===o&&(o=Math.pow(10,t)),Math.round(o*a)/o+0},o=function(a,t,o){return void 0===t&&(t=0),void 0===o&&(o=1),a>o?o:a>t?a:t},r=function(a){var t=a/255;return t<.04045?t/12.92:Math.pow((t+.055)/1.055,2.4)},h=function(a){return 255*(a>.0031308?1.055*Math.pow(a,1/2.4)-.055:12.92*a)},n=96.422,p=100,M=82.521,u=function(a){var t,r,n={x:.9555766*(t=a).x+-.0230393*t.y+.0631636*t.z,y:-.0282895*t.x+1.0099416*t.y+.0210077*t.z,z:.0122982*t.x+-.020483*t.y+1.3299098*t.z};return r={r:h(.032404542*n.x-.015371385*n.y-.004985314*n.z),g:h(-.00969266*n.x+.018760108*n.y+41556e-8*n.z),b:h(556434e-9*n.x-.002040259*n.y+.010572252*n.z),a:a.a},{r:o(r.r,0,255),g:o(r.g,0,255),b:o(r.b,0,255),a:o(r.a)}},e=function(a){var t=r(a.r),h=r(a.g),u=r(a.b);return function(a){return{x:o(a.x,0,n),y:o(a.y,0,p),z:o(a.z,0,M),a:o(a.a)}}(function(a){return{x:1.0478112*a.x+.0228866*a.y+-.050127*a.z,y:.0295424*a.x+.9904844*a.y+-.0170491*a.z,z:-.0092345*a.x+.0150436*a.y+.7521316*a.z,a:a.a}}({x:100*(.4124564*t+.3575761*h+.1804375*u),y:100*(.2126729*t+.7151522*h+.072175*u),z:100*(.0193339*t+.119192*h+.9503041*u),a:a.a}))},w=216/24389,b=24389/27,i=function(t){var r=t.l,h=t.a,n=t.b,p=t.alpha,M=void 0===p?1:p;if(!a(r)||!a(h)||!a(n))return null;var u=function(a){return{l:o(a.l,0,400),a:a.a,b:a.b,alpha:o(a.alpha)}}({l:Number(r),a:Number(h),b:Number(n),alpha:Number(M)});return l(u)},l=function(a){var t=(a.l+16)/116,o=a.a/500+t,r=t-a.b/200;return u({x:(Math.pow(o,3)>w?Math.pow(o,3):(116*o-16)/b)*n,y:(a.l>8?Math.pow((a.l+16)/116,3):a.l/b)*p,z:(Math.pow(r,3)>w?Math.pow(r,3):(116*r-16)/b)*M,a:a.alpha})};export default function(a,r){a.prototype.toLab=function(){return o=e(this.rgba),h=o.y/p,u=o.z/M,r=(r=o.x/n)>w?Math.cbrt(r):(b*r+16)/116,a={l:116*(h=h>w?Math.cbrt(h):(b*h+16)/116)-16,a:500*(r-h),b:200*(h-(u=u>w?Math.cbrt(u):(b*u+16)/116)),alpha:o.a},{l:t(a.l,2),a:t(a.a,2),b:t(a.b,2),alpha:t(a.alpha,3)};var a,o,r,h,u},a.prototype.delta=function(r){void 0===r&&(r="#FFF");var h=r instanceof a?r:new a(r),n=function(a,t){var o=a.l,r=a.a,h=a.b,n=t.l,p=t.a,M=t.b,u=180/Math.PI,e=Math.PI/180,w=Math.pow(Math.pow(r,2)+Math.pow(h,2),.5),b=Math.pow(Math.pow(p,2)+Math.pow(M,2),.5),i=(o+n)/2,l=Math.pow((w+b)/2,7),c=.5*(1-Math.pow(l/(l+Math.pow(25,7)),.5)),f=r*(1+c),y=p*(1+c),v=Math.pow(Math.pow(f,2)+Math.pow(h,2),.5),x=Math.pow(Math.pow(y,2)+Math.pow(M,2),.5),z=(v+x)/2,s=0===f&&0===h?0:Math.atan2(h,f)*u,d=0===y&&0===M?0:Math.atan2(M,y)*u;s<0&&(s+=360),d<0&&(d+=360);var g=d-s,m=Math.abs(d-s);m>180&&d<=s?g+=360:m>180&&d>s&&(g-=360);var N=s+d;m<=180?N/=2:N=(s+d<360?N+360:N-360)/2;var F=1-.17*Math.cos(e*(N-30))+.24*Math.cos(2*e*N)+.32*Math.cos(e*(3*N+6))-.2*Math.cos(e*(4*N-63)),L=n-o,I=x-v,P=2*Math.sin(e*g/2)*Math.pow(v*x,.5),j=1+.015*Math.pow(i-50,2)/Math.pow(20+Math.pow(i-50,2),.5),k=1+.045*z,q=1+.015*z*F,A=30*Math.exp(-1*Math.pow((N-275)/25,2)),B=-2*Math.pow(l/(l+Math.pow(25,7)),.5)*Math.sin(2*e*A);return Math.pow(Math.pow(L/1/j,2)+Math.pow(I/1/k,2)+Math.pow(P/1/q,2)+B*I*P/(1*k*1*q),.5)}(this.toLab(),h.toLab())/100;return o(t(n,3))},r.object.push([i,"lab"])}
